Moving GRID disk group files to another disk group

To migrate all content from +GRID diskgroup to another newly created one, we need to know what is the list of necessary files that are located on it:

  • ASM password file
  • ASM Spfile
  • OCR
  • Voting files
  • OCR backups (if configured on the same diskgroup)

Let’s migrate all of them one by one:

Migrate ASM password file

1. Locate the Oracle ASM password file:

[grid@rac1 ~]$ asmcmd pwget --asm
+GRID/orapwASM

2. Migrate the password file:

[grid@rac1 ~]$ asmcmd pwmove --asm -f +GRID/orapwASM +GRID2/orapwASM
moving +GRID/orapwASM -> +GRID2/orapwASM

3. Verify that the file has a new path:

[grid@rac1 ~]$ asmcmd pwget --asm
+GRID2/orapwASM

Migrate ASM Spfile

1. Locate the Oracle ASM SPFILE:

[grid@rac1 ~]$ asmcmd spget
+GRID/marirac/ASMPARAMETERFILE/registry.253.1088678891

2. Migrate the spfile:

[grid@rac1 ~]$ asmcmd spmove +GRID/marirac/ASMPARAMETERFILE/registry.253.1088678891 +GRID2/marirac/ASMPARAMETERFILE/spfileASM
ORA-15032: not all alterations performed
ORA-15028: ASM file '+GRID/marirac/ASMPARAMETERFILE/registry.253.1088678891' not dropped; currently being accessed (DBD ERROR: OCIStmtExecute)

The error message can be ignored, the new location will be used after we restart CRS.

3. Verify:

[grid@rac1 ~]$ asmcmd spget
+GRID2/marirac/ASMPARAMETERFILE/spfileASM

Migrate OCR

1. Get the current OCR location:

[grid@rac1 ~]$ ocrcheck -config
Oracle Cluster Registry configuration is :
	 Device/File Name         :      +GRID

2. Move OCR:

[grid@rac1 ~]$  ocrconfig -add +GRID2
PROT-20: Insufficient permission to proceed. Require privileged user

[grid@rac1 ~]$ exit
logout

[root@rac1 ~]# ocrconfig -add +GRID2
[root@rac1 ~]# ocrconfig -delete +GRID

3. Verify:

[root@rac1 ~]# ocrcheck -config
Oracle Cluster Registry configuration is :
	 Device/File Name         :     +GRID2

Migrate voting files

1. Get the current location:

[root@rac1 ~]# crsctl query css votedisk
##  STATE    File Universal Id                File Name Disk group
--  -----    -----------------                --------- ---------
1. ONLINE   544b7b2dc9f14f8dbf8f5c560a32a95f (/dev/flashgrid/rac2.xvdba) [GRID]
2. ONLINE   c4035c7009be4f26bffd663651e4d520 (/dev/flashgrid/rac1.xvdba) [GRID]
3. ONLINE   5737c31731574fa8bf2acc107fbbd364 (/dev/flashgrid/racq.xvdba) [GRID]
Located 3 voting disk(s).

2. Move:

[root@rac1 ~]# crsctl replace votedisk +GRID2
Successful addition of voting disk 26221fd4d7334fa8bfc98be1908ee3ef.
Successful addition of voting disk 093f9c21b9864f87bfc4853547f05a16.
Successful addition of voting disk 9c2a9fd2fc334f7ebfb44c04bdb0cf57.
Successful deletion of voting disk 544b7b2dc9f14f8dbf8f5c560a32a95f.
Successful deletion of voting disk c4035c7009be4f26bffd663651e4d520.
Successful deletion of voting disk 5737c31731574fa8bf2acc107fbbd364.
Successfully replaced voting disk group with +GRID2.
CRS-4266: Voting file(s) successfully replaced

3. Verify:

[root@rac1 ~]# crsctl query css votedisk
##  STATE    File Universal Id                File Name Disk group
--  -----    -----------------                --------- ---------
1. ONLINE   26221fd4d7334fa8bfc98be1908ee3ef (/dev/flashgrid/rac1.xvdbc) [GRID2]
2. ONLINE   093f9c21b9864f87bfc4853547f05a16 (/dev/flashgrid/rac2.xvdbc) [GRID2]
3. ONLINE   9c2a9fd2fc334f7ebfb44c04bdb0cf57 (/dev/flashgrid/racq.xvdbz) [GRID2]
Located 3 voting disk(s).

Moving OCR backup

Please note that having OCR backup on the same location where OCR is located is not a good practice, you should have another disgroup for that. So let’s assume, we have separate DG for that.

1. Check the current location:

[root@rac1 ~]# ocrconfig -showbackup

rac2     2021/11/29 17:07:02     +GRID:/marirac/OCRBACKUP/backup00.ocr.276.1089911215     1443639413

rac2     2021/11/25 16:52:08     +GRID:/marirac/OCRBACKUP/backup01.ocr.275.1089564721     1443639413

rac2     2021/11/21 14:13:23     +GRID:/marirac/OCRBACKUP/backup02.ocr.277.1089209597     1443639413

rac2     2021/11/29 17:07:02     +GRID:/marirac/OCRBACKUP/day.ocr.272.1089911223     1443639413

rac1     2021/11/15 15:05:26     +GRID:/marirac/OCRBACKUP/week.ocr.273.1088694327     1443639413
PROT-25: Manual backups for the Oracle Cluster Registry are not available

2. Reconfigure:

[root@rac1 ~]# ocrconfig -backuploc +FRA

There are automatic OCR backups that are taken in the past 4 hours, 8 hours, 12 hours, and in the last day and week. Until this time passes, we can run manual backup for safety:

[root@rac1 ~]# ocrconfig -manualbackup

rac2     2021/11/30 12:20:15     +FRA:/marirac/OCRBACKUP/backup_20211130_122015.ocr.257.1089980415     1443639413

3. Verify:

[root@rac1 ~]# ocrconfig -showbackup

rac2     2021/11/29 17:07:02     +GRID:/marirac/OCRBACKUP/backup00.ocr.276.1089911215     1443639413

rac2     2021/11/25 16:52:08     +GRID:/marirac/OCRBACKUP/backup01.ocr.275.1089564721     1443639413

rac2     2021/11/21 14:13:23     +GRID:/marirac/OCRBACKUP/backup02.ocr.277.1089209597     1443639413

rac2     2021/11/29 17:07:02     +GRID:/marirac/OCRBACKUP/day.ocr.272.1089911223     1443639413

rac1     2021/11/15 15:05:26     +GRID:/marirac/OCRBACKUP/week.ocr.273.1088694327     1443639413

rac2     2021/11/30 12:20:15     +FRA:/marirac/OCRBACKUP/backup_20211130_122015.ocr.257.1089980415     1443639413

Backup best practices for Oracle Clusterware

I recommend you to backup clusterware related files after initial setup and at any change. The backup files can save you from OCR, OLR corruption during GI patch. If any of the files become corrupted you will be able to recover it in several minutes (or seconds). Depends on the failure, you may lose several hours to recover your cluster to the state it was before something happened.

Here are the steps to protect your cluster:

1. Backup ASM spfile initially and at any change.

There are several ways to backup ASM spfile using spcopy, spbackup or create pfile=<backup location> from spfile.

To locate the Oracle ASM SPFILE, use the ASMCMD spget command:

ASMCMD> spget
+GRID/myrac/ASMPARAMETERFILE/registry.253.974466047

Copy the Oracle ASM SPFILE to the backup location:

ASMCMD> spbackup +GRID/myrac/ASMPARAMETERFILE/registry.253.974466047 /backup/spfileasm.ora

2. Backing up ASM password file once should be enough. If you change password for pwfile users or add another user into the list, then make a new backup.

Locate the password file using the ASMCMD pwget command.

ASMCMD> pwget --asm
+GRID/orapwASM

Back up the password file to another location with the pwcopy command.

ASMCMD> pwcopy +GRID/orapwASM  /backup/orapwASM 
copying +GRID/orapwASM -> /backup/orapwASM

3. Use md_backup command to create a backup file containing metadata for one or more disk groups.

To backup metadata for all disk groups, do the following:

ASMCMD> md_backup /tmp/dgmetabackup

Disk group metadata to be backed up: DATA
Disk group metadata to be backed up: FRA
Disk group metadata to be backed up: GRID

In case you need to backup metadata only for a specific disk group, use -G option.

4. Backup OLR on each node.

If OLR is missing or corrupted, clusterware can’t be started on that node. So make manual backup initially and after any change:

Do the following on each node:

# ocrconfig -local -manualbackup

Copy generated file to the backup location:

# cp /u01/app/12.2.0/grid/cdata/rac1/backup_20180510_230359.olr /backup/

Or change default backup location to /backup before making the actual backup:

# ocrconfig -local -backuploc /backup

# ocrconfig -local -manualbackup

5. Mirror and Backup OCR.

You should configure OCR in two independent disk groups. Typically, this is the work area and the recovery area. At least two OCR locations should be configured.

# ocrconfig -add +FRA

There are automatic OCR backups that are taken in the past 4 hours, 8 hours, 12 hours, and in the last day and week.

You can also manually backup OCR before applying any patch or upgrade GI home:

# ocrconfig -manualbackup

Regularly save taken backup to another location using the following way:

Identify the latest backup (manual or automatic):

[grid@rac1 ~]$ ocrconfig -showbackup
rac1 2018/05/10 13:06:18 +GRID:/myrac/OCRBACKUP/backup00.ocr.289.975762375 830990544
..

Copy it to the backup location:

$ ocrconfig -copy +GRID:/myrac/OCRBACKUP/backup00.ocr.289.975762375 /backup/backup00.ocr

Or change default backup locations to another diskgroup other than GRID:

# ocrconfig -backuploc +FRA